What are the eight different blood types?

What are the eight different blood types?

• A. A+, A-, B+, B-, AB+, AB-, O+, O-
• B. A+, B+, AB+, O+ and their negatives
• C. A-, B-, AB-, O-, AB+, A+
• D. A+, A-, B-, B+, AB-, AB+, O+, O-

Answer: (A)

Blood type comes from whether red blood cells have A or B antigens and whether the Rh factor is present. This creates eight possible combinations: A+, A-, B+, B-, AB+, AB-, O+, O-. The complete list above is the standard set of all eight types, with each ABO type paired with both Rh positive and Rh negative forms. Other descriptions may omit a type or not present the full set, so they don’t show all eight possibilities.

Blood type comes from whether red blood cells have A or B antigens and whether the Rh factor is present. This creates eight possible combinations: A+, A-, B+, B-, AB+, AB-, O+, O-. The complete list above is the standard set of all eight types, with each ABO type paired with both Rh positive and Rh negative forms. Other descriptions may omit a type or not present the full set, so they don’t show all eight possibilities.